I'm absolutely convinced this is a very rare case when OS/2 can fit the requirements of an ordinary user.
Either we are super-duper-lucky, or a user uses OS/2 just for the sake of it, like I do.
When talking about ordinary users, GNU/Linux nowadays does not even remotely convey that inconvenience as OS/2 does: unlike OS/2, each and every PC use case of an everyday user is absolutely possible and common with GNU/Linux. And even considering professional use cases, it already is mostly the subject of, yes, comfort level, productivity, convenience and habits, but not general impossibility. Regarding the user interface differences, the transition between an old Windows UI and Windows 10 and higher is merely of the same impediment level as of that is of to any GNU/Linux window manager (some of them will resemble the classical Windows interface in many ways, and some of them, like Unity, will go the Mac OS way, and pretty well).
Hence my point of view is that although I would absolutely agree with the immediate necessity of calling new users into the world of OS/2, I reject the "ordinary" part: it is just a no-go. Without user's itself desire to use this very operating system, it ain't no gonna work.